[ Modals and Vocabulary ]
Which sentence is appropriate to express no obligation?
A. You must clean your room before leaving.
B. You don’t have to clean your room before leaving.
C. You can’t clean your room before leaving.
D. You may not clean your room before leaving.
Select your answer:

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Modals and Advice › ViewCould she have forgotten her keys at home?
A. Definitely
B. Maybe
C. No
D. Yes
Gerund › View
He began by ___ the meeting of certain words.
A. explaining
B. explained
C. explain
D. to explain
